Electronic flash unit



FIG. 1 is a front perspective view of an electronic _flash unit, showing our new design,

FIG. 2 is a front plan view thereof,

FIG. 3 is a rear plan view thereof,

FIG. 4 is a right side plan view thereof,

FIG. 5 is a left side plan view thereof,

FIG. 6 is a top plan view thereof,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for an electronic flash unit, substantially as shown and described. 